Bugcheck : 0x1000000a error

I've been having quite a problem with my computer rebooting. It doesn't reboot often, but at least once a week. I've attached a some dump files for anyone who knows how to read these. Can someone please look into helping me find what's wrong?

The computer has rebooted from a bugcheck. The bugcheck was: 0x1000000a (0xf7b8211c, 0x000000ff, 0x00000001, 0x805469e9). A dump was saved in: C:\WINDOWS\Minidump\Mini021009-01.dmp.

Bug checks 0xA are strong indications of hardware issues though they can also be caused by drivers attemting to access an IRQ Level that they shouldn't. The problem with your dump is that it cited a core Windows driver and they are usually too general to help.

We need more information. Besides the minidump you've already posted please give us your five most recent. You can Zip five together. Please don't Zip each and every one.

Rebooting can be caused by several things such as heat or bad RAM. There are other causes. You could check you memory by doing the following:

1. Go to www.memtest.org and download the latest ISO version. It is free and perfectly safe.

2. Burn to a CD.

3. Place CD in your drive and reboot with CD in drive. The test will take over.

4. Let it run for a LONG time. The rule is a minimum of 7 Passes. There are 8 individual tests per Pass. Many people will start this test before going to bed and check it the next day.

5. If you have errors you have corrupted memory and it needs to be replaced.

6. Also, with errors you need to run this test per stick of RAM. Take out one and run the test. Then take that one out and put the other in and run the test. If you start getting errors before 7 Passes you know that stick is corrupted and you don’t need to run the test any further on that stick.